49913781 has 16 divisors (see below), whose sum is σ = 68273280. Its totient is φ = 32426240.

The previous prime is 49913753. The next prime is 49913783. The reversal of 49913781 is 18731994.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 49913781 - 2¹¹ = 49911733 is a prime.

It is a super-2 number, since 2×49913781² = 4982771067431922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49913783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17641 + ... + 20273.

It is an arithmetic number, because the mean of its divisors is an integer number (4267080).

Almost surely, 2^49913781 is an apocalyptic number.

It is an amenable number.

49913781 is a deficient number, since it is larger than the sum of its proper divisors (18359499).

49913781 is a wasteful number, since it uses less digits than its factorization.

49913781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796.

The product of its digits is 54432, while the sum is 42.

The square root of 49913781 is about 7064.9685774248. The cubic root of 49913781 is about 368.1912723570.

The spelling of 49913781 in words is "forty-nine million, nine hundred thirteen thousand, seven hundred eighty-one".